aws/aws-cdk

aws-applicationautoscaling: Target Tracking Scaling Policy does not support account for custom metric

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#36,401 opened on 2025年12月16日

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@aws-cdk/aws-applicationautoscalingeffort/smallfeature-requestgood first issuep2

説明

Describe the bug

Target Scaling Policy does not return the account information from the metric so cross account metric cannot be used.

https://github.com/aws/aws-cdk/blob/244c02de488a9dfe7dad9eca1e9bb301863216bc/packages/aws-cdk-lib/aws-applicationautoscaling/lib/target-tracking-scaling-policy.ts#L170

Regression Issue

  • Select this option if this issue appears to be a regression.

Last Known Working CDK Library Version

No response

Expected Behavior

The renderCustomMetric function the target tracking policy should return the account from the metric as well

https://github.com/aws/aws-cdk/blob/244c02de488a9dfe7dad9eca1e9bb301863216bc/packages/aws-cdk-lib/aws-applicationautoscaling/lib/target-tracking-scaling-policy.ts#L162C10-L162C28

Current Behavior

The account information is never fetched from the metric so it default to the current account when creating it

Reproduction Steps

Create a Target Tracking Policy using a Custom Metric and specify the a different account for the metric and it will be ignored

Possible Solution

No response

Additional Information/Context

No response

AWS CDK Library version (aws-cdk-lib)

2.223.0

AWS CDK CLI version

2.1031.2

Node.js Version

22.9.0

OS

Amazon Linux 2023

Language

Python

Language Version

3.11

Other information

No response

コントリビューターガイド

技術スタック
typescriptaws
領域
backendcloud
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
1-3 hours
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
active
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
TypeScriptAWS CDKUnderstanding of CloudFormation metrics
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
40
調査方針
The bug is located in the renderCustomMetric function in the file packages/aws cdk lib/aws applicationautoscaling/lib/target tracking scaling policy.ts (lines 162-170). The issue is that the function currently doesn't include the account from the metric, so cross account metrics default to the current account. A contributor should examine how the metric's account property can be accessed and modify the rendering logic to include it. Additionally, ensure that any other functions that generate metric configurations also account for this property. Check the linked file and the autoscaling documentation for reference.
aws-applicationautoscaling: Target Tracking Scaling Policy does not support account for custom metric · aws/aws-cdk#36401 | Good First Issue